{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "In both sediment types , oxygen radical absorbance capacity ( ORAC ) and antioxidant enzyme activities [ superoxide dismutase ( SOD ) and catalase ( CAT ) ] increased during hypoxia , suggesting that M . affinis has a strategy of preparation for oxidative stress that facilitates recovery after a hypoxic episode ."}
{"Chemical": ["oxygen", "superoxide"]}